Will be used to instantiate the internal Map.
Optional
iterable: Iterable<readonly [string, WebSocket | ReadonlySet<WebSocket>]>Entries to add to the map.
Readonly
[tothe number of elements in the Map.
Adds the given key/value binding to the Map.
Loops over all key/value bindings.
Optional
thisArg: anyAdds a new element with a specified key and value to the Map. If an element with the same key already exists, the element will be updated.
A SetMultiMap linking identifiers to a set of WebSockets. An extension of WrappedSetMultiMap to make sure Components.js allows us to create this in the config, as WrappedSetMultiMap has a constructor not supported.